Characterization of locally Isolated Streptomyces Species and their Potentialities as Sources of Antifungal Agents

Fifty isolates of Streptomyces were recovered from soil samples collected from different locations in Sudan. All of the isolates were screened for their abilities to inhibit the growth of certain pathogenic fungi. These included: Cryptococcus humicolus, Penicillium sp., Asperigillus flavus, Asperigillus niger, Candida albicans, and Fusarium oxysporium. The inhibition zone diameters recorded...

Isolation, Identification, Serotyping and Antibiotic Susceptibility Testing of Human Salmonella in Khartoum State

One hundred thirty human faeces samples from outpatients at a number of public hospitals within Khartoum State were investigated for the presence of Salmonella species. Cultural, biochemical and serological tests resulted in the recovery of 60 Salmonella isolates. API 20E tests and serotyping confirmed the identity of forty one of the sixty isolates as Salmonella. The forty one...

Estimation of Natural Variability and Induced Mutations in Some Pearl Millet (Pennisetum glaucum L.) Genotypes

In this study 20 pearl millet genotypes were evaluated for morphological and yield parameters. Karyotypic analyses were conducted for the four selected genotypes. These genotypes were compared by means of Randomized Amplified Polymorphic DNA (RAPD). Biochemically, they were compared in the leaf pigments content and the activity of the isozyme peroxidase. The performance of the selected...

The Influence of Plant Growth Promoters on Nitrate Reductase, Protein and Nitrates in Young Seedlings of Cotton and Mize

There was a remarkable similarity in the response of the two seedlings of cotton and maize to the growth promoters used in this investigation. The levels of nitrate reductase activity, proteins and nitrates were greatly enhanced by these hormones. Simulation of the above parameters was positively correlated with the concentration of the hormones. Response in the roots of both seedlings was...

Characterization of Native Guar Rhizobia and Their Cross Inoculation Abilities Among Different Guar (Cyamopsis tetragonoloba (L.) Taub.) lines

Nineteen Rhizobium isolates were extracted from the root nodules of different guar lines (Cyamopsis tetragonoloba (L.)Taub.) which were grown randomly on different soil samples collected from eleven different localities in Sudan. Eleven of the isolates were selected and authenticated as guar rhizobia. Cross–inoculation experiments showed a wide range in the degree of line x isolate efficiency....

Induced Mutation in Some Guar (Cyamopsis tetragonoloba) lines Using Gamma Irradiation and Sodium Azide

A mutagenesis study was carried on seeds of two lines of guar L18 and L14, which were bombarded with doses of 150, 300, 450 and 600 Gy gamma irradiation. Part of the irradiated seeds with the dose 300 Gy and untreated seeds were then soaked separately in 40 or 80 mM of sodium azide for 20 or 30 hours and germinated in vitro to evaluate germination per cent. Another part of the irradiated seeds...

Purification and Characterization of Eight Enzymes Isolated from Seedlings of Different Sorghum Lines

Yield improvement is the primary objective of most sorghum breeding programmes and many sorghum lines are released every year. However, nutritional and quality attributes of these lines are rarely given consideration within breeding programme. Therefore, there is a need for further characterization to both biochemical and molecular levels with respect to food quality. Selection of lines meeting...

Antibacterial, Antiviral And Phytochemical Investigations On Some Sudanese Medicinal Plants

The present study includes antibacterial, antiviral screening and phytochemical investigations on some Sudanese medicinal plants with emphasis on the phytochemistry of three species. Sixty chloroformic and methanolic crude extracts were prepared from 23 medicinal plants, belonging to 21 families and were screened against three bacterial pathogens which are Escherichia coli, Klebsiella...

Observations On The Phytoplankton And Water Quality Of The Blue Nile At Khartoum

The seasonal changes in phytoplankton species composition and biomass as well as the physical and chemical characteristics of the Blue Nile were studied at Khartoum from May 2000 to February 2002. The data obtained on the phytoplankton during the present study were related to variations in nutrient concentrations and other environmental variables .The results were compared with those...

Diversity and cross inoculation abilities among rhizobia isolated from different guar (Cyamobsis tetragonoloba (L.) Taub.) lines

Ten Rhizobium isolates were isolated from the root nodules of ten guar lines. The isolates were authenticated each with it’s respective host (line) of isolation. Cross-inoculation experiments revealed a wide range in the degree of line-isolate efficiency. The majority of guar lines benefited from Rhizobium inoculation. This was reflected in the high shoot dry weight and nitrogen content...